package com.holystone.orca.util;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

import java.util.HashSet;
import java.util.Set;

/**
 * Copyright (c) 2015, HOLYSTONE Technologies, Inc.
 * All right reserved.
 *
 * @desc:
 * @author:fengt
 * @date:15/12/11
 * @Time:下午1:50
 */
public class ObjectCopyUtil {

    /**
     * 获取对象中的空属性
     * @param source
     * @return
     */
    public static String[] getNullPropertyNames (Object source) {
        final BeanWrapper src = new BeanWrapperImpl(source);
        java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();

        Set<String> emptyNames = new HashSet<String>();
        for(java.beans.PropertyDescriptor pd : pds) {
            Object srcValue = src.getPropertyValue(pd.getName());
            if (srcValue == null) emptyNames.add(pd.getName());
        }
        String[] result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }


    /**
     * 忽略对空属性的拷贝
     * @param src
     * @param target
     */
    public static void copyPropertiesIgnoreNull(Object src, Object target){
        BeanUtils.copyProperties(src, target, getNullPropertyNames(src));
    }
    
}
